diff --git a/README.md b/README.md
index 9731e8e..9b51ccc 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,8 @@ specs:
   * [rfc8314](https://tools.ietf.org/html/rfc8314) Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access
   * [rfc8437](https://tools.ietf.org/html/rfc8437) IMAP UNAUTHENTICATE Extension for Connection Reuse
   * [rfc8474](https://tools.ietf.org/html/rfc8474) IMAP Extension for Object Identifiers
+
+## Existing projetcs that could help us
+
+  * [maddy](https://foxcpp.dev/maddy/) full-featured easy-to-setup email server. IMAP storage is "beta".
+	* [go-emersion](https://github.com/emersion/go-imap/) a client and server IMAP implementation. The client implem is used by alps.